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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc2a8f4134a6769b08fb47d62847b0ecaf660a1258f4aa0a932fac28407b5ff' 
  AND token = 'SFD18w5cjVHNCPylGYBeE1M7MvJ9VwzK8nDyLYNyjTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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