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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57cff69f8faa5e21106b8af6cae914435670a27ea723ea1bad872b910ccfb5f' 
  AND token = 'WF7U531IGODHCXsfq3WYPwgaNbF0WRwiXy/59ZCTeDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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