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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76db44e13687dbf9f1a2899f5b6651674d1ee08b4752cd1c4fc764e95c295cf9' 
  AND token = '4kWWd2Am8CrZv62ai0EjFhaG/e1/u6yKCPs4RcmFmeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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