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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84de07cadc8c95067e45d833c2804e7187acf1044d5bde995f494525a0daf56' 
  AND token = '4qXmOr6z3wMiDwW4X4U0OEw8jpeI8HxoBxxUQlC311k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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