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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f5240d268cae2aa6a11c51d08e1ca048289625373fb08af234cd4530b7bc1b' 
  AND token = 'qCcayZ9Ghi7V0XijrOPJVwl7Fh/j3bcnmqiIV3Po9uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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