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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb41935d75c60f1da661471c85674ae09a8f6b6a78cedb52e1ac1e4362aed4be' 
  AND token = '7ZoBNWDQnolv/fCIPYTf/+D9vP+E5nchekWTpyn148M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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