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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb13e0f02f7f736c3304c7420915db958a24c6308c5a0f29c5570af82c4537b' 
  AND token = 'bASHtVp1HHhphs9pjmosXv7uqnH8FMlXVL4dGm0Gxv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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