SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091a284ff0b93ced208d60a634065cde4761f8083d3fb7b70f98c2cf4a45ae69' 
  AND token = 'OGog0HVFbSahywPUiXVBJet+2Y7rM3j2aJW+xHhBiNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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