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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c9aab1699c0c39f42db2c374e4c5c03fb3eb29027724d0dea98aa0a731ec7a' 
  AND token = 'Dl8RPWkmPoOVE7+JZR4NsX898L5G7TULxNqFuIonke8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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