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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80bac548aa1d6d3df79e56f7276b8e520b67db63b7a22b3a9f3db86128d4d177' 
  AND token = 'yNmPWs7UepHRY5OsZH4jgjFd0bAcnJcx/4oJT59r4hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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