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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1694b8431dde3b96a140785288a7292b40c890e5a0ce7501332ee70bcae9cf8' 
  AND token = 'bhtcjncnMFM6mClK0EgKRdBomk2JI2Bv4bJeRyclPEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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