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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53c08cfc02a48bbfd02d6226a88f3e4d426a13de730bc5e29ee9078b98462ea0' 
  AND token = 'dWnNTu27LBLhLIEPpGq3pYV1P04xk1zmlMnmSXf0DkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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