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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9912b185eebd25e5d4e66950013060998c3ea201aa9eb77ba76af2ec6f419ef5' 
  AND token = '4aDat6a+aAxehgA9D1vGJ5dJ2r7eUFsGRkK8HPRHdy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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