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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7557c31a08cb85e4e63057f251c121f930c88a88e783c0529977ec5e8ee1e9' 
  AND token = 'bNTGoXp1JlE0wqbVqEPk/XXSx85Ek5WCmCUtA5VCAgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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