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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f2a3e4eee1d9219b2a0f3ee673da9c14f13f7dd007fdea5659e582a32e6f5f' 
  AND token = 'owuYqFTHLuU8esAbMcf6pmYXwCJsVail6QHhxjE0qhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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