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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c82d1a45c3ab2d067dad3d834f8acb1bd366249a56399da811cc2b2b775b94' 
  AND token = 'NtmoUv9HnM64DaZUwmC4PWf5kFGrwjyDonuneEKiin0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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