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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807491ad5e51631e2474b81d7052e37fd854630b192a520dbcd1ea3704e9bd3c' 
  AND token = 'JiNRqJSx2YdWLVpTRJiQA5LX4UP8Jp5C8sbQr68ETso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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