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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832823d76561020f1c1209bb425a03428d8081c47b3533fa9f689399d8ec4951' 
  AND token = 'dgjTmjs50XGtYw54cJ3kYKhfW0z0Ri7o3Nx84iq94jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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