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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b683fd940d3e94f6e052c2b113b0e76c66cd142e6a2df26bd7ef9d6dbc26ac91' 
  AND token = 'WbQFXg/558s9Xv1LZx4NqFI87xSCOIJSnMaDQoW1Qm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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