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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eddadef1e2db7d4cbf6c43932fb88f3dfb25bca37b86bd603c4378a0f03dbe5c' 
  AND token = 'avY3TqadAIXzmBbGhX+cYC6/g0A25v0kU5mEutr1bLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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