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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa9ab19889229658fdc6270897a2b1aa0c23eca3bec4dd6eb6cf37c6c130adb' 
  AND token = 'lVAo76zjyaEQG9kf5NsqYYN+FQjuTiSRP++OVCfIXxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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