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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d1c924fef2390534a216f82e0cc43fcf3fc6e958f1a0f5202fe6710736153f' 
  AND token = 'MkFqmrG8F+KHUqA9IjcNcf7P5yqWDlPoFWXbZgiLOwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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