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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c82079021606d684213f4f68d28044e6ce5183cb9c3cb4ec5ef164e0a7164e6' 
  AND token = 'F6J70LQJWhXVr8B2Un4f+wjL775V5pUOn9MAUv5vLhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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