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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89f686ea726680a8f508f9b7bf8d358ee573c5f38d1dc99933ca403b09654f0' 
  AND token = 'JJTo2ButwSoMe5SUGN0OW0lJ/r+L9HAR6SIEf94tmp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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