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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca117f291721a32882060c0c75876eb1995aeaae7f11f50109585c9eceae2ff' 
  AND token = 'jAk5RnGlcjAON033kcIbA/nHsptxSN9pUAsA9YWeYV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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