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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ebf78cccae195983c9ac5883227f79896cfb35bf1ba6dbaf01001a27b2a0b9' 
  AND token = 'CcJ972Ht6A18kY6FE7WQKaNXgdpcaM+6DLm7TI8uUEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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