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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959f31879ce5da24883f570d3387bbbde97f1cc10439f4af9bc2dd6a376864f6' 
  AND token = 'o6k2St43L5BN3I7DGCbLOXZ+cb6GggPK0354WtSXzpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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