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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728e0b9ca14ffa47ccf76b7b19c207786c3d2e3d50e419f482f14079d76d5534' 
  AND token = 'SSSovSFKIJG3ac1M63BRcGoBVrXadq1urHC2ODuCFmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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