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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762dd6f8bf22c2ef76bab81d943b3e6f1caa2316b9c13542458a1df55ecfd56f' 
  AND token = 'yIavOPclMoUFvcFIOrIFgbQJsmWZahD9acvd5TMdQKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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