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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cad1ba7f53b441b78c4f01926266b49d2fba6424ad284876fc672b31ade48e' 
  AND token = 'tc2PSc3ME1x/L3aEclDkU8xqP4RRfJCRCecFrWODMOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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