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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe45b4b2d327d271e0da539deaaec8f8d19c20f1c1e5dcace7da132c4073c23' 
  AND token = 'LiWQrKWO4igOVCQhQuSV3QwUKzbxRCmkfusRmEaQcT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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