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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e8a1702e75a1c136fff7de96ab150df86d54c0a36a8e9254938b320b0bb34c' 
  AND token = 'kiGwmIBbzSckcCA/MTlNSYeHkPO62U0cKo8vakpbEWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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