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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7df1db1fbf80cdb1e7628f3256135deea4b60ebd0ea02095843d6428ae663d4' 
  AND token = '6M1pZLhq8a+QQmaSfiErHJZ5LBCr2fosjlrc+OesR2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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