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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d8724eca3227c89bc38ac652a935176eba43a8b5340ab831da7d8cb73111b6' 
  AND token = '3hMxG2zO0/ihMZQjQ4wPv6RO52uhIBf5INA7jwp/hK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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