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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34188ae597d2f166b7935bd80f7f02e4d56612cbe2141d018f8a70b127432613' 
  AND token = 'qqzV9xcdLIB6E6VMyiRC/RoW1V1facVKmzCmiQN87ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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