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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd828ac7b2b3da4c123344ee6ef1ca3166183784c041a53b486c04b8eec223f5b' 
  AND token = 'uopuZQMWrSs7YkMnV5PAnbJvMQ9GUO7R6fAITqmdLdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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