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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b03478150cb07fda53b054adba31c914b87343f20598932f615ee7d25c03605' 
  AND token = 'PEB+FqZWM56w78kvW9hksiIHRnHseNzyBohKrC7y4yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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