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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7d934f94252b091a1169ca0ae4a4b8b37d75af3dd0f9f9c3701c4482f4abf4' 
  AND token = '/CQAkrRDqZQtEG3p74+7Xe1iZNo+7feQii4sL2PmmRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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