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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6338b24e5b8d4d11f156736f7653900071b3e0c262e0a390573e03746273910' 
  AND token = 't8eLOk3UsapJzC2mkDMfX9MGhCEnOtqHs/SDweUyvrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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