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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc9ccf3f4d07358b8e499dc3f9e9f11fe00810a3faffde2aaf639ccfc36440f' 
  AND token = 'NOXz7/ZgA8PTI0GePDtinU1TCWr1HIVogl3b8XaP2MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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