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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf0686cf5d2faf3bb7f708fdbcfe0958c2e0032d0e1ed2cf1458d7a75ab81e4' 
  AND token = 'pGpYIUMMOzk0AcPPngsL4TRRqlev0a54QvxZQgyU1gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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