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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b954399ac1f9b6fc91ee9d45faf53b008fa5efb3e36c9690f970ec590c9adf' 
  AND token = 'wh2PcVnEUTAiRK1++RoLfhDMC7TmM/B3kIYCVCXLZvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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