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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c6666b1149125bb555a9fdb8d2239776d23a55360b4e33cc3acab4dd493e93' 
  AND token = '9Ay/FlbbkzIc8aE3hlTfsicRbf7VqagukRZc8BFQyV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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