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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79caecf7180c3d58508d6207444244b6cb2f6f3b5461c86e8d8669c5c24e4c4d' 
  AND token = 'NbalG0LNAghqFE9f8fBKQLlQpZWlV8Gv4oUTuWMOa4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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