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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72b10873a1a65026b2559e68b4cba2be4e470b3098b88b8e43104ccb3748489' 
  AND token = 'snHQCcO67G5Ke4aSl82wEipuyu9Ckzm6HiOV2WpzoK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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