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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76f022f4fea8eeaf4254bc67677eb4f2f0cd794cc824def99e54520c282d79c' 
  AND token = 'MJ9nBNJQDIxxtdfdLBxl3G/FhFM2dlekXk1LTFf4xWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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