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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd408d207fa52a4e0eb1f2bea7f35b195922d7656e9554a1b586a2cf7ee3fed1c' 
  AND token = 'il4W4bX2//GxpQ05u1foWERC6NOyhwduYFMmMTay1po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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