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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e863fac8e242224e0cedf8c9236b7e63100b2e0f680340069b29e2e6608e8f0b' 
  AND token = 'NFS/D3WubhTSeewrZtwdscUecpf0Trhzh9lN0QC2M9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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