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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e76d0e6114697dbbb3b9216bf14e4fce6532e516ed8d7fa877d3b2c24fbc468' 
  AND token = 'nG9uqP8+eiChfRWGZDU0QTCvuJPyft17GzWLnC6/EzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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