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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15259fef087962f31954aab74ff799bdb3db1d7662969ad2decfe6d32a34e3d8' 
  AND token = 'b+m1UUvYnJjb2v8kOMN7z8keh0V/eLiSyMqyEqg422U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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