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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b1beb857d3c5dad942711eca3f45d1200c6c965193514ed401f2e7f7bf819a' 
  AND token = 'CfUBSraI8lOPXAUihOM5Z54XtmRDyVe2I4KpKG3L7do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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