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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4649c96204cf0e165bb9d616e94a7dbe7a422dd788ed56f6bb446057ff8a845f' 
  AND token = 'DJRUOqRJAUedH5gQg5k3gOPlr+tTEVNxVJHvnLLMYKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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