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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bc38e04d060e95042b058abd04824254b8885b24ec7f57ea71f5c632ad21f6' 
  AND token = 'bQbye/1TLnyS1RhOc0rbuvUnq09sv95UFMihCAYcIZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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