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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf9ca51b8333a6ba799c895455fb694aee6107cfd7fc85ec1eb1888575de23a' 
  AND token = 'nYJix6uYYdQYdfeC23/gUjYdui7owLvDSfAurgNOSnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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