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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17262ae5c548a103eb5339b14d09090de07a712c3f98c5e41fcd7032526b166' 
  AND token = '7Cn82IsRm5A6/zMChEpxKOOA1Xu7AqqseWQzf9JvqE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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