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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793900f3a5de1412adf8af3fd7b7e21353dd5c500f51045900659f125625bf1c' 
  AND token = 'x5bi4a1vHfjn2Oe4xVvGNvN24dt/wrXRYnw1IHzwP5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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