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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad938bd62559bf704ec59713233c51dd02c0a2e1086be9a7a224451891d9232f' 
  AND token = '7N5OUOy/XGxNBvaqLlOouXd4QOIZzWBuJ+yJ5XiquWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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