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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e30074bf4a2c5f206d9780e8969e685a9f616b641fd25a0d4aa13ab45f4dc65' 
  AND token = '1kYswhpdTNS1m1/Os5EJ5G3VbboRjgvioHnkpC4cKxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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