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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bede78f066898da6cd449a6b7bcae9bcaa256069aebfc58c64ead98b44a9cb27' 
  AND token = 'sQl02D7+w0g2uiGGKryIeGRq1Guz1dP3++Ia7i5gQsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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