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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4723b007bd0b5d19e304c76cd67c139dbd0a4b3e3ded32e0c2c946b3b2b2eda' 
  AND token = 'D1XsKPHTPoAwFJrPvd1XAotDyCk0gFImXI3CmXYqGgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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