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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dcd6c162f6b9b9894f86c97862e576a9ba1b2bf99f1d356faa88df0fa6ad21' 
  AND token = 'bC0ACvfVfNR7ju3MUtWOQIJyss2F25PJ0FoDDg8mH+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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