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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1528f2a5d24d851c82f1b8e6ca1f6717cce5343615776f1866e87e66b80e66' 
  AND token = 'FCiU28dIfIHY4ezTy7xabOiMH67wbQm0hnr2D6TlN8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}