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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f90bfa5a4f6d3c1b45ba3666049f4cb8f88083620f64fb3138843b7ce1cc1d' 
  AND token = 'ohrQ5/Qm75DXpAUdJ2hfonCyL46pTiaGBq7Oe1ASAQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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